본 연구에서는 쏘일네일로 보강된 사면을 한계평형 해석법과 2차원 유한차분 해석을 수행하여 그 결과를 비를 분석하였다. 특히, 유한차분법을 이용한 FLAC 2D를 바탕으로 하는 커플링 해석에 주안점을 두었으며, FLAC을 이용하여 전단강도감소기법에 따른 보강사면의 안전율을 계산하기 위해 FLAC의 내장언어인 FISH를 이용하여 작성하였다. 커플링 해석에서 보일네일에 의한 안정화된 사면을 해석하기 위해 쏘일네일 거동과 사면안정을 동시에 고려하였다. 따라서 본 연구에서는 이 두 방법을 적용하여 쏘일네일의 사면내 설치위치, 설치각도, 설치간격 등에 따라 각각의 활동파괴면 및 안전율을 비판분석하였으며 강도정수 감소법을 적용한 해석기법의 적용성과 타당성 분석을 수행하였다.
본 연구에서는 쏘일네일로 보강된 사면을 한계평형 해석법과 2차원 유한차분 해석을 수행하여 그 결과를 비를 분석하였다. 특히, 유한차분법을 이용한 FLAC 2D를 바탕으로 하는 커플링 해석에 주안점을 두었으며, FLAC을 이용하여 전단강도감소기법에 따른 보강사면의 안전율을 계산하기 위해 FLAC의 내장언어인 FISH를 이용하여 작성하였다. 커플링 해석에서 보일네일에 의한 안정화된 사면을 해석하기 위해 쏘일네일 거동과 사면안정을 동시에 고려하였다. 따라서 본 연구에서는 이 두 방법을 적용하여 쏘일네일의 사면내 설치위치, 설치각도, 설치간격 등에 따라 각각의 활동파괴면 및 안전율을 비판분석하였으며 강도정수 감소법을 적용한 해석기법의 적용성과 타당성 분석을 수행하였다.
In this paper, a numerical comparison of predictions by limit equilibrium analysis and finite difference analysis is presented for slope/soil-nail system. Special attention is given to the coupled analysis based on the explicit-finite-difference code, FLAC 2D. To this end, an internal routine (FISH)...
In this paper, a numerical comparison of predictions by limit equilibrium analysis and finite difference analysis is presented for slope/soil-nail system. Special attention is given to the coupled analysis based on the explicit-finite-difference code, FLAC 2D. To this end, an internal routine (FISH) was developed to calculate a factor of safety for a soil nail slope according to shear strength reduction method. The case of coupled analyses was performed for soil nails in slope in which the soil nails response and slope stability are considered simultaneously. In this study, by using these methods, the failure surfaces and factors of safety were compared and analyzed in several cases, such as toe, middle and top of the slope, respectively. Furthermore, the coupled method based on shear strength reduction method was verified by the comparison with other analysis results.
In this paper, a numerical comparison of predictions by limit equilibrium analysis and finite difference analysis is presented for slope/soil-nail system. Special attention is given to the coupled analysis based on the explicit-finite-difference code, FLAC 2D. To this end, an internal routine (FISH) was developed to calculate a factor of safety for a soil nail slope according to shear strength reduction method. The case of coupled analyses was performed for soil nails in slope in which the soil nails response and slope stability are considered simultaneously. In this study, by using these methods, the failure surfaces and factors of safety were compared and analyzed in several cases, such as toe, middle and top of the slope, respectively. Furthermore, the coupled method based on shear strength reduction method was verified by the comparison with other analysis results.
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제안 방법
In this study, a coupled analysis of slopes stabilized with a soil nail has been presented and discussed based on an analytical study and a numerical study. The numerical results are compared with those obtained by the limit equilibrium method for slope stability analysis.
However with the increasing speed of the desktop computer, the technique is becoming a reasonable alternative to the method of slices, and is being used increasin이y in engineering practice. In this study, factors of safety obtained with the shear strength reduction technique were investigated for the soil nail on the stability of the homogeneous slope. The case of an uncoupled analysis using limit equilibrium analysis and subsequently the response of coupled analysis based on the shear strength reduction method were performed to illustrate the changes of critical surface invariably due 128 Jour, of the KGS, Vol.
이론/모형
The reinforcing effect of soil nail was simplified as an axial tension that acted at the base of the slice where the slip s니intersects the soil nail. Based on the concept of Bishop's simplified method, this approach is conventionally used to calculate the safety factor of slopes reinforced with soil nails. Bishop's simplified method takes the equilibrium of forces in the vertical direction for each slice to calculate the normal force at the base of the 이ice, and gives the safety factor by taking the equilibrium of moments about the centre of the slip circle for all slices.
Here, a slope failure that the surface of sliding intersects the slope at its toe is considered. Based on this, it is obvious that the feilure mechanism, indicated by the nodal velocities in the shear strength reduction techniques, agrees well with the failure surface given by the Bishop's simplified method, as shown in Fig. 5.
In this study, a coupled analysis of slopes stabilized with a soil nail has been presented and discussed based on an analytical study and a numerical study. The numerical results are compared with those obtained by the limit equilibrium method for slope stability analysis. A limited study of numerical analysis was carried out to examine nail/slope coupling effect on relative nail position, different nail spacing and install angle.
The response of a slope/nail system is analyzed by using a twoviimensional explicit-finite difference approach. The mesh consists of solid elements and is assumed to be resting on a rigid layer, and the vertical boundaries at the left- and right-hand sides are assumed to be on rollers to allow movement of soil layers.
(2000), etc. The shear strength reduction technique is used in this study. It has a number of advantages over the method of slices for slope stability analysis.
The uncoupled analysis is carried out using SLOPEAV based on the limit equilibrium method. When the slope is not reinforced with nails, the shear strength reduction techniques and the Bishop's simplified method gave safety factors of 1.
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